Drinking mug



FIG. 1 is a bottom front perspective view of a drinking mug showing my new design;

FIG. 2 is a top rear perspective view thereof;

FIG. 3 is a bottom rear perspective view thereof;

FIG. 4 is a top front perspective view thereof;

FIG. 5 is a right side elevational view of FIG. 4; and,

FIG. 6 is a top plan view thereof. 

The ornamental design for a drinking mug, as shown. 